package thread;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 线程池
 * 线程池是线程的管理机制,它主要解决两个问题
 * 1:控制线程数量
 * 2:复用线程
 */
public class ThreadPoolDemo {
    public static void main(String[] args) {
        ExecutorService threadPool = Executors.newFixedThreadPool(2);
        for (int i = 0; i <5 ; i++) {
            Runnable r =new Runnable() {
                @Override
                public void run() {
                    Thread t =Thread.currentThread();
                    System.out.println(t.getName()+":正在执行任务...");
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        System.out.println("中断了");
                    }
                    System.out.println(t.getName()+":执行任务完毕");
                }
            };
            threadPool.execute(r);
            System.out.println("将一个任务交给了线程池...");
        }

//        threadPool.shutdown();
//        System.out.println("线程池停止了!");
        threadPool.shutdownNow();
        System.out.println("线程池停止了!");
    }
}
